scholarly journals Dual-tracer-based isotope turnover rates in a highly invasive mysid Limnomysis benedeni from Lake Constance

2017 ◽  
Vol 7 (12) ◽  
pp. 4173-4178
Author(s):  
Elizabeth Yohannes ◽  
Karl-Otto Rothhaupt
Keyword(s):  
Lake Constance ◽  
Turnover Rates ◽  
Isotope Turnover ◽  
Limnomysis Benedeni ◽  
Dual Tracer

Tissue-specific isotope trophic discrimination factors and turnover rates in a marine elasmobranch: empirical and modeling results

2012 ◽  
Vol 69 (3) ◽  
pp. 551-564 ◽  
Author(s):  
Luis Malpica-Cruz ◽  
Sharon Z. Herzka ◽  
Oscar Sosa-Nishizaki ◽  
Juan Pablo Lazo
Keyword(s):  
Natural Populations ◽  
Nitrogen Isotope ◽  
Cartilage Tissue ◽  
Turnover Rates ◽  
Isotopic Equilibrium ◽  
Isotope Turnover ◽  
Discrimination Factors ◽  
Triakis Semifasciata ◽  
Leopard Sharks ◽  
Trophic Discrimination

There are very few studies reporting isotopic trophic discrimination factors and turnover rates for marine elasmobranchs. A controlled laboratory experiment was conducted to estimate carbon and nitrogen isotope trophic discrimination factors and isotope turnover rates for blood, liver, muscle, cartilage tissue, and fin samples of neonate to young-of-the-year leopard sharks ( Triakis semifasciata ). Trophic discrimination factors varied (0.13‰–1.98‰ for δ13C and 1.08‰–1.76‰ for δ15N). Tissues reached or were close to isotopic equilibrium to the new diet after about a threefold biomass gain and 192 days. Liver and blood exhibited faster isotope turnover than muscle, cartilage tissue, and fin samples, and carbon isotopes turned over faster than those of nitrogen. Metabolic turnover contributed substantially to isotopic turnover, which differs from most reports for young marine teleosts. We modeled the relationship between muscle turnover rates and shark size by coupling laboratory results with growth rate estimates for natural populations. Model predictions for small, medium, and large wild leopard sharks indicate the time to isotopic equilibrium is from one to several years.

scholarly journals Autecology of Limnomysis benedeni Czerniavsky, 1882 (Crustacea: Mysida) in Lake Constance, Southwestern Germany

Limnologica ◽  
2008 ◽  
Vol 38 (2) ◽  
pp. 139-146 ◽  
Author(s):  
René Gergs ◽  
Almut J. Hanselmann ◽  
Isabelle Eisele ◽  
Karl-Otto Rothhaupt
Keyword(s):  
Lake Constance ◽  
Limnomysis Benedeni

The feeding ecology and field energetics of the Pedra Branca skink (Niveoscincus palfreymani)

2003 ◽  
Vol 30 (1) ◽  
pp. 81
Author(s):  
Nigel Brothers ◽  
Alan Wiltshire ◽  
David Pemberton ◽  
Nick Mooney ◽  
Brian Green
Keyword(s):  
Feeding Ecology ◽  
Endemic Species ◽  
Water Exchange ◽  
Turnover Rates ◽  
Free Living ◽  
Isotope Turnover ◽  
Important Prey ◽  
Fish Remains

The diet and food requirements of free-living Pedra Branca skinks (Niveoscincus palfreymani) were studied on Pedra Branca Island, the only known location for this vulnerable, endemic species. While discarded fish remains and regurgitate from seabirds are utilised as food by the skinks during summer, invertebrates represent the most important prey. Isotope turnover rates indicate that feeding is negligible over winter and that significant amounts of non-food water are turned over during summer, either by drinking rainwater or as pulmo-cutaneous water exchange. An assessment is made of the seasonal and annual food requirements of individual skinks and the population.

scholarly journals Estimating stable isotope turnover rates of epidermal mucus and dorsal muscle for an omnivorous fish using a diet-switch experiment

Hydrobiologia ◽  
2018 ◽  
Vol 828 (1) ◽  
pp. 245-258 ◽  
Author(s):  
Emily R. Winter ◽  
Emma T. Nolan ◽  
Georgina M. A. Busst ◽  
J. Robert Britton
Keyword(s):  
Stable Isotope ◽  
Turnover Rates ◽  
Dorsal Muscle ◽  
Omnivorous Fish ◽  
Isotope Turnover ◽  
Epidermal Mucus ◽  
Diet Switch

Colloidal systems in soils

1994 ◽  
Vol 52 ◽  
pp. 64-65
Author(s):  
J. Thieme ◽  
J. Niemeyer ◽  
P. Guttman
Keyword(s):  
Clay Minerals ◽  
Polymeric Materials ◽  
Spatial Arrangement ◽  
High Specific Surface Area ◽  
Turnover Rates ◽  
Colloidal Systems ◽  
Chemical Conditions ◽  
Aggregation Phenomena ◽  
Iron And Manganese ◽  
Soil Colloids

In soil science the fraction of colloids in soils is understood as particles with diameters smaller than 2μm. Clay minerals, aquoxides of iron and manganese, humic substances, and other polymeric materials are found in this fraction. The spatial arrangement (microstructure) is controlled by the substantial structure of the colloids, by the chemical composition of the soil solution, and by thesoil biota. This microstructure determines among other things the diffusive mass flow within the soils and as a result the availability of substances for chemical and microbiological reactions. The turnover of nutrients, the adsorption of toxicants and the weathering of soil clay minerals are examples of these surface mediated reactions. Due to their high specific surface area, the soil colloids are the most reactive species in this respect. Under the chemical conditions in soils, these minerals are associated in larger aggregates. The accessibility of reactive sites for these reactions on the surface of the colloids is reduced by this aggregation. To determine the turnover rates of chemicals within these aggregates it is highly desirable to visualize directly these aggregation phenomena.

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